World braille usage. - Mackenzie, Clutha Nantes 1895-1966.; Unesco; Library of Congress. National Library Service for the Blind and Physically Handicapped (Paris Unesco, 1990)
"Sir Clutha Mackenzie ... provided the first Unesco edition of World Braille Usage in 1953"--Pref.
Jointly published with National Library Service for the Blind and Physically Handicapped, Library of Congress.
Keywords: Braille; Blind -- Printing and writing systems